"They are really cute together," a source tells Us of Kloss and her handsome beau, a social gaming entrepreneur and venture capitalist who's pals with Ashton Kutcher (a successful dot-com investor in his own right).

Kloss has previously dated St. Louis Rams quarterback Sam Bradford. Kloss and fellow Angel Joan Smalls (who also walked during Wednesday's show) were recently named the new co-hosts of a revamped version of MTV's House of Style. The show premiered last month.